code: def testRead(self):
      file_path = os.path.join(self._base_dir, "temp_file")
      with gfile.GFile(file_path, mode="w") as f:
          f.write("testing1\ntesting2\ntesting3\n\ntesting5")
      with gfile.GFile(file_path, mode="r") as f:
          self.assertEqual(36, gfile.stat(file_path).length)
          self.assertEqual("testing1\n", f.read(9))
          self.assertEqual("testing2\n", f.read(9))
          self.assertEqual("t", f.read(1))
          self.assertEqual("esting3\n\ntesting5", f.read())
  
imports: import os.path
  from tensorboard import test
  from tensorboard.compat.tensorflow_stub import compat, errors
  from tensorboard.compat.tensorflow_stub.io import gfile
label_desc: Use image node_id 19 for calling the FileIoTest obj's underlying member method code with example usage: obj.testRead() without return types